Port Authority of Allegheny County

Reporting mark: PAT
Berry Street Tunnel (Allegheny County, Pennsylvania)
Built 1851-1856; Converted to road use 1998
Tunnel on West Busway
Open to traffic

PAT - Monongahela River Bridge (Allegheny County, Pennsylvania)
14 panel Baltimore through truss bridge over Monongahela River, many city streets and I-376 on Panhandle Railroad/ Pittsburgh T Transit
Open to traffic

PAT - Mount Washington Tunnel (Allegheny County, Pennsylvania)
Built 1902-4
Tunnel on Port Authority of Allegheny County Busway/Light Rail
Open to PAT traffic only.

Smithfield Street Bridge (Allegheny County, Pennsylvania)
Built 1883 under the direction of engineer Gustav Lindenthal
Two-span lenticular through truss bridge over Monongahela River on Smithfield Street in Pittsburgh
Open to four lanes of traffic